318 lines
12 KiB
C
318 lines
12 KiB
C
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/*
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* Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
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* Copyright (c) 2011 Stefano Sabatini
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/**
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* @file
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* Apply a boxblur filter to the input video.
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* Ported from MPlayer libmpcodecs/vf_boxblur.c.
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/common.h"
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#include "libavutil/opt.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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#include "boxblur.h"
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typedef struct BoxBlurContext {
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const AVClass *class;
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FilterParam luma_param;
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FilterParam chroma_param;
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FilterParam alpha_param;
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int hsub, vsub;
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int radius[4];
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int power[4];
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uint8_t *temp[2]; ///< temporary buffer used in blur_power()
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} BoxBlurContext;
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static av_cold void uninit(AVFilterContext *ctx)
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{
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BoxBlurContext *s = ctx->priv;
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av_freep(&s->temp[0]);
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av_freep(&s->temp[1]);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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AVFilterFormats *formats = NULL;
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int fmt, ret;
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for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
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if (!(desc->flags & (AV_PIX_FMT_FLAG_HWACCEL | AV_PIX_FMT_FLAG_BITSTREAM | AV_PIX_FMT_FLAG_PAL)) &&
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(desc->flags & AV_PIX_FMT_FLAG_PLANAR || desc->nb_components == 1) &&
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(!(desc->flags & AV_PIX_FMT_FLAG_BE) == !HAVE_BIGENDIAN || desc->comp[0].depth == 8) &&
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(ret = ff_add_format(&formats, fmt)) < 0)
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return ret;
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}
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return ff_set_common_formats(ctx, formats);
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}
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static int config_input(AVFilterLink *inlink)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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AVFilterContext *ctx = inlink->dst;
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BoxBlurContext *s = ctx->priv;
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int w = inlink->w, h = inlink->h;
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int ret;
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if (!(s->temp[0] = av_malloc(2*FFMAX(w, h))) ||
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!(s->temp[1] = av_malloc(2*FFMAX(w, h))))
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return AVERROR(ENOMEM);
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s->hsub = desc->log2_chroma_w;
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s->vsub = desc->log2_chroma_h;
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ret = ff_boxblur_eval_filter_params(inlink,
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&s->luma_param,
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&s->chroma_param,
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&s->alpha_param);
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if (ret != 0) {
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av_log(ctx, AV_LOG_ERROR, "Failed to evaluate "
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"filter params: %d.\n", ret);
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return ret;
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}
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s->radius[Y] = s->luma_param.radius;
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s->radius[U] = s->radius[V] = s->chroma_param.radius;
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s->radius[A] = s->alpha_param.radius;
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s->power[Y] = s->luma_param.power;
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s->power[U] = s->power[V] = s->chroma_param.power;
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s->power[A] = s->alpha_param.power;
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return 0;
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}
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/* Naive boxblur would sum source pixels from x-radius .. x+radius
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* for destination pixel x. That would be O(radius*width).
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* If you now look at what source pixels represent 2 consecutive
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* output pixels, then you see they are almost identical and only
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* differ by 2 pixels, like:
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* src0 111111111
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* dst0 1
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* src1 111111111
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* dst1 1
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* src0-src1 1 -1
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* so when you know one output pixel you can find the next by just adding
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* and subtracting 1 input pixel.
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* The following code adopts this faster variant.
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*/
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#define BLUR(type, depth) \
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static inline void blur ## depth(type *dst, int dst_step, const type *src, \
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int src_step, int len, int radius) \
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{ \
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const int length = radius*2 + 1; \
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const int inv = ((1<<16) + length/2)/length; \
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int x, sum = src[radius*src_step]; \
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\
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for (x = 0; x < radius; x++) \
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sum += src[x*src_step]<<1; \
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\
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sum = sum*inv + (1<<15); \
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\
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for (x = 0; x <= radius; x++) { \
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sum += (src[(radius+x)*src_step] - src[(radius-x)*src_step])*inv; \
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dst[x*dst_step] = sum>>16; \
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} \
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\
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for (; x < len-radius; x++) { \
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sum += (src[(radius+x)*src_step] - src[(x-radius-1)*src_step])*inv; \
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dst[x*dst_step] = sum >>16; \
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} \
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\
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for (; x < len; x++) { \
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sum += (src[(2*len-radius-x-1)*src_step] - src[(x-radius-1)*src_step])*inv; \
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dst[x*dst_step] = sum>>16; \
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} \
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}
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BLUR(uint8_t, 8)
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BLUR(uint16_t, 16)
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#undef BLUR
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static inline void blur(uint8_t *dst, int dst_step, const uint8_t *src, int src_step,
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int len, int radius, int pixsize)
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{
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if (pixsize == 1) blur8 (dst, dst_step , src, src_step , len, radius);
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else blur16((uint16_t*)dst, dst_step>>1, (const uint16_t*)src, src_step>>1, len, radius);
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}
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static inline void blur_power(uint8_t *dst, int dst_step, const uint8_t *src, int src_step,
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int len, int radius, int power, uint8_t *temp[2], int pixsize)
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{
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uint8_t *a = temp[0], *b = temp[1];
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if (radius && power) {
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blur(a, pixsize, src, src_step, len, radius, pixsize);
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for (; power > 2; power--) {
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uint8_t *c;
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blur(b, pixsize, a, pixsize, len, radius, pixsize);
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c = a; a = b; b = c;
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}
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if (power > 1) {
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blur(dst, dst_step, a, pixsize, len, radius, pixsize);
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} else {
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int i;
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if (pixsize == 1) {
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for (i = 0; i < len; i++)
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dst[i*dst_step] = a[i];
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} else
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for (i = 0; i < len; i++)
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*(uint16_t*)(dst + i*dst_step) = ((uint16_t*)a)[i];
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}
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} else {
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int i;
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if (pixsize == 1) {
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for (i = 0; i < len; i++)
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dst[i*dst_step] = src[i*src_step];
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} else
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for (i = 0; i < len; i++)
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*(uint16_t*)(dst + i*dst_step) = *(uint16_t*)(src + i*src_step);
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}
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}
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static void hblur(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize,
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int w, int h, int radius, int power, uint8_t *temp[2], int pixsize)
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{
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int y;
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if (radius == 0 && dst == src)
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return;
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for (y = 0; y < h; y++)
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blur_power(dst + y*dst_linesize, pixsize, src + y*src_linesize, pixsize,
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w, radius, power, temp, pixsize);
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}
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static void vblur(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize,
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int w, int h, int radius, int power, uint8_t *temp[2], int pixsize)
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{
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int x;
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if (radius == 0 && dst == src)
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return;
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for (x = 0; x < w; x++)
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blur_power(dst + x*pixsize, dst_linesize, src + x*pixsize, src_linesize,
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h, radius, power, temp, pixsize);
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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AVFilterContext *ctx = inlink->dst;
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BoxBlurContext *s = ctx->priv;
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AVFilterLink *outlink = inlink->dst->outputs[0];
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AVFrame *out;
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int plane;
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int cw = AV_CEIL_RSHIFT(inlink->w, s->hsub), ch = AV_CEIL_RSHIFT(in->height, s->vsub);
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int w[4] = { inlink->w, cw, cw, inlink->w };
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int h[4] = { in->height, ch, ch, in->height };
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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const int depth = desc->comp[0].depth;
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const int pixsize = (depth+7)/8;
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out) {
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av_frame_free(&in);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(out, in);
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for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++)
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hblur(out->data[plane], out->linesize[plane],
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in ->data[plane], in ->linesize[plane],
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w[plane], h[plane], s->radius[plane], s->power[plane],
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s->temp, pixsize);
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for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++)
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vblur(out->data[plane], out->linesize[plane],
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out->data[plane], out->linesize[plane],
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w[plane], h[plane], s->radius[plane], s->power[plane],
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s->temp, pixsize);
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av_frame_free(&in);
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return ff_filter_frame(outlink, out);
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}
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#define OFFSET(x) offsetof(BoxBlurContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption boxblur_options[] = {
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{ "luma_radius", "Radius of the luma blurring box", OFFSET(luma_param.radius_expr), AV_OPT_TYPE_STRING, {.str="2"}, .flags = FLAGS },
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{ "lr", "Radius of the luma blurring box", OFFSET(luma_param.radius_expr), AV_OPT_TYPE_STRING, {.str="2"}, .flags = FLAGS },
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{ "luma_power", "How many times should the boxblur be applied to luma", OFFSET(luma_param.power), AV_OPT_TYPE_INT, {.i64=2}, 0, INT_MAX, .flags = FLAGS },
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{ "lp", "How many times should the boxblur be applied to luma", OFFSET(luma_param.power), AV_OPT_TYPE_INT, {.i64=2}, 0, INT_MAX, .flags = FLAGS },
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{ "chroma_radius", "Radius of the chroma blurring box", OFFSET(chroma_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "cr", "Radius of the chroma blurring box", OFFSET(chroma_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "chroma_power", "How many times should the boxblur be applied to chroma", OFFSET(chroma_param.power), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },
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{ "cp", "How many times should the boxblur be applied to chroma", OFFSET(chroma_param.power), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },
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{ "alpha_radius", "Radius of the alpha blurring box", OFFSET(alpha_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "ar", "Radius of the alpha blurring box", OFFSET(alpha_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "alpha_power", "How many times should the boxblur be applied to alpha", OFFSET(alpha_param.power), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },
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{ "ap", "How many times should the boxblur be applied to alpha", OFFSET(alpha_param.power), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(boxblur);
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static const AVFilterPad avfilter_vf_boxblur_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_input,
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.filter_frame = filter_frame,
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},
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{ NULL }
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};
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static const AVFilterPad avfilter_vf_boxblur_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter ff_vf_boxblur = {
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.name = "boxblur",
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.description = NULL_IF_CONFIG_SMALL("Blur the input."),
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.priv_size = sizeof(BoxBlurContext),
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.priv_class = &boxblur_class,
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = avfilter_vf_boxblur_inputs,
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.outputs = avfilter_vf_boxblur_outputs,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
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};
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